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Property, plant and equipment (Detail) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Insurance and Other [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | $ 61,352 | $ 58,711
Property, plant and equipment, accumulated depreciation | (30,616) | (28,640)
Total property, plant and equipment, net | 30,736 | 30,071
Insurance and Other [Member] | Land, buildings and improvements [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 21,612 | 20,735
Insurance and Other [Member] | Machinery and equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 33,611 | 32,475
Insurance and Other [Member] | Furniture, fixtures and other [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 6,129 | 5,501
Railroad [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 93,790 | 91,672
Property, plant and equipment, accumulated depreciation | (21,965) | (20,411)
Total property, plant and equipment, net | 71,825 | 71,261
Railroad [Member] | Land, track structure and other roadway [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 75,996 | 74,093
Railroad [Member] | Locomotives, freight cars and other equipment [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 15,591 | 15,766
Railroad [Member] | Construction in progress [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 2,203 | 1,813
Utilities and Energy [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 154,861 | 146,885
Property, plant and equipment, accumulated depreciation | (45,107) | (43,116)
Total property, plant and equipment, net | 109,754 | 103,769
Utilities and Energy [Member] | Utility generation, transmission and distribution systems [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 106,751 | 103,015
Utilities and Energy [Member] | Interstate natural gas pipeline assets [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 20,646 | 20,237
Utilities and Energy [Member] | Independent power plants and other [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 15,619 | 14,840
Utilities and Energy [Member] | Construction in progress [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Property, plant and equipment, gross | 11,845 | 8,793
Railroad, Utilities and Energy [Member] |  |
Property, Plant and Equipment [Line Items] |  |
Total property, plant and equipment, net | $ 181,579 | $ 175,030

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